Vacuum condensation pump



Apll', 1943- A. c. DURDIN, JR 2,315,946`

VCUUM CONDENSATION PUMP Filed April 7, 1941 4 'Sheets-Sheet lllllllflllll//llll/ j April 6, 1943.

A. C. DURDIN, JR

VACUUM CONDENSATION PUMP Filed April 7, 1941 4 sheets-sheet 2 A. 'C.DURDIN, JR vacUUM coNDENsgT'IoN PUMP Filed April 7. 1941vl 4'Sheets-Sheet 3 April 6,. 1943 A. c. DURDINQJR 2,315,946

VACUUM CONDENSATION PUMP INVENTOR.

. Patentedl Apr. 6, 1943 asians T" for-Flos vAcUuMcoNnENsArroN PourAugustus C. Durdin, Jr.,lLincolnwood, Ill'. f Application 'spi-u 7,1941, serial No. :87.118

14 chime This invention relates to vacuum condensa.-

' tion pumps such as are employed for creating (ci. a-s) vacuum` in thereturn mains of steam heating systems and for collecting the waterotcondensation, vapors. air and non-condensible gasses therefrom andreturning the water to the boiler or other desired place.

The invention has particular reference tovthat type of vacuumcondensation pump which employs a water pump for discharging the waterfrom a receiving chamber, and a'vacuumpump. which employs water for itsoperation, for creating vacuum in the receiving chamber and obtainingits hurlingwater from -a hurling water chamber.

One of the objects oi this invention is to provide a valve controlledport between the receiving chamber and the hurling water chamber,controlled by the level of water in the hurling water chamber, to openthe port and permit pressure in the two chambers to equalize, whereby toprevent hurling water from leaking too rapidly from the hurling waterchamber through Athe pumps and intothe receiving chamber, particularlywhen the pump is shut down at night and the boiler 1s shut down.

Another object is to provide pressure equalizing means between thereceiving chamber andthe hurling water chamber, whereby a sumcient headof hurling water is always maintained for the operation of the vacuumpump. 1 v

Another object is to provide s. valve controlled port between thehurling water chamber and the receiving chamber, controlled by the levelof the water in the hurling water chamber, for permitting water to nowfrom the hurling water chamber to the receiving chamber whenever thewater in the hurling water chamberrises above a predetermined level.

Another object is to provide a make-up water inletV from the receivingchamber to the vacuum pump, ywhereby to replenish any loss of hurlingwater. .f

Another object is to provide a. hurling water chamber, separate fromthereceiving chamber, arranged to hold .a supply of hurling water andconnected by conduits to the water inlet and discharge of the vacuumpump.

Another object is to provide a receiving'chamber, which has its bottomdisposed belowA the outlet to the .water pump, with a make-up waterinlet to an air conduit, which conveys the air and non-condensiblegasses from thefreceiving chamber to the vacuum pump, which water inletis always below the surface of the Water in the receiving chamber. andnannte water tothe air conduit after all .of the water has escaped thatcan be siphoned out through the water outlet by reason of a drop inpressure in the' boiler below that in the receiving chamber.

Another object is to provide a. vacuum condensation pump in the formo! aunit, composed of a minimum number oi' separate parts and capable ofbeing easily and readih' assembled.

With these and -other objects and advantages in view, thisfinventionconsists in the several novel features of construction, arrangement andcombination of parts hereinatterfully set forth andclalmed. i

The invention isl clearly illustrated in the drawings accompanying thisspeciilcation, in which:

Fig. l is la central longitudinal vertical section through a vacuumcondensation pump, embodying one form of the present invention.

Fig. 2is a horizontal section taken on the line 2-2 of Fig. 1.

Fig. 3'is an enlarged detail vertical longitudinal section taken throughfragments or the tank and air conduit.

Fig. 4 is a vertical cross-section taken on the line 4-4 o! Fig.- .1. f

Fig. 5 is a vertical cross-section taken on the line B-S of F18. l.

6-is of Fig l1. s. 7 is an end-elevationofthe tank. ,n

' f Figs. l'and 7. 8 ls a vertical cross-section taken yon the linev 9-8of Figs. 1 and 10.

Fig.` 10 is a horizontal section taken on the line lli- I0 of Fig. 9.

Fig. 11 is a vertical longitudinal section taken on the line II-II ofFig. 4.

Fig. 12 is an enlarged detail side view of a oat valve, which controlsthe port between the hurling water chamber and receiving chamber.

Fig. 13 is an end view'of said valve looking in the direction oi thearrow I3 in Fig. 12.

Fig. 14 is anAV enlarged detail vertical section through the shaftcouplingbetween the motor shaft and impeller shaft, the line of sectionbeing indicated atIl-Il in Fig. 1.

Fig. 15 is a horizontal sectiontaken on the line |5--I5 Of F18. 14.

a horizontal section taken on the line I a horizontal section taken onthe line hereinafter described vacuum pump,

I8, and entiv walls I9, Il, The side and end walls project down belowthe bottom I1 lto provide a hollow base 20, upon is carried.

A vertical partition 2| divides the tank into a receiving chamber 12 anda hurling water chamber 23, which chambers are entirely separate fromeach other, Ialthough they are connected by a valve controlled port 2l,through which water from thehurling water chamber may dow into thereceiving chamber when the waterlevel in the hurling water chamber risesabove a predetermined level, and through which air may flow from thehurling water chamber into the receiving chamber whenever the water inthe hurling water chamber falls below the said predetermined level. Thepurposes of the iicat controlled portl which the entire structurel areto. prevent flooding of the hurling water chamber and to equalize thepressure in the two chambers under certain conditions that may '-arise,especially when the pump is shut down.

An inlet passage connects the vreceiving chamber with the inlet opening2l for the water of condensation, air and other-non-condensible gaseswhich are usually conveyed to the pump by the return mains. anddischargeinto an inlet fitting 2l, bolted or otherwise fastened to aside wall of the tank overthe inlet opening 2C. The inlet passage 2l isformed by two upright crosswalls 29, which extend up from the plane ofthe bottom wall I1 of the tank and are connected at their upper andlower ends by walls n, e. The walls, which define the inlet passage,Join with water level, and in the dotted lines H3 the position itoccupies when the water level falls below the predetermined level. Ineither of the dotted line positions, one of the fingers i5 engages theball and unseats it. Ii' the water has risen above the predeterminedlevel, the iloat lever unseats the ball and permits water to ilow fromthe hurling water chamber to thereceiving discharge conduits are cast asa part of the tank and open out through openings, disposed below the endwall I9* of the tank.

the partition 2| and side wall I8 oi the tank and the partition isformed with an opening 21 therein, which opens from the; receivingchamber to the inlet passage.

The partition 2| extends below the bottom wall I1 as at 2l, and joinswith a bottom wall 3|, which forms the bottom of the hurling waterVchamber and joins with the side wall I8 or the tank. From the above, itis apparent that the hurling water chamberis o1' greater depth than the.receiving chamber.

some vapor, wmonoo'oumuiates 1n the receiv- The water inlet conduit I2is formed by upper I and lower walls 36, 31 and side walls 38, locatedin the interior of the base and forming an L shaped conduit that Thedischarge conduit Il is located at a higher level than the inletcondultand .has top, bottom and side walls lo, u, u, that lead from thesame end of the base as the conduit- 32, to aconvenient place inl thehurling water chamber and terminate in a hub il ih` which is held thelower end of a vertical water and air discharge pipe M, which extends uppart wayin the hurling water chamber vand is provided with a splashplate 45, supported at a place slightly above the discharge end of thepipe. A bracket 4B. which projectsfrom a wall oi the hurling waterchamber, and surrounds the discharge' pipe M, forms a lateral supporttherefor. In the operation of the vacuum pump.

ing chamber, is carried along with the air to the and makeup water isdrawn. into the vacuum pump from the receiving chamber and is dischargedinto the hurling water chamber, where'it accumulates. To prevent thewater from-flooding the hurling water chamber or being dischargedthrough the hereinafter mentioned air vent pipe. the port 24 is providedwith a float controlled valve which is here shown as comprising a valveseat I Il, naving a nipple threadedly secured in the t'op wall 30 of theinlet passage 2l; a valve Hi, preferably in the form of a ball, seatsupon the Yvalve seat and closes the opening therethrough, except whenunseated. Fulcrumed upon upstanding ears H2 that rise from the valveseat, is a oat lever ||3 which has a ball oat i4 on Lthe end of one arm,and two fingers lil on its other y arm, which lingers straddle the balland act to unseat it whenever the float lever is moved up or down fromits normal position, which position is controlled by a predeterminedlevel oi the water in the hurling water chamber. The ears ||2 arearranged yon the sides oi the ball and prevent it from escaping from itsseat.

Fig. l2 illustrates in solid lines the position in which the iloat leveris held when the water level stands atits predetermined height; in thedotted lines H3* the oat lever is shown in a position occupied when thewater reaches a high it draws its hurling water from the hurling waterchamber, through the water inlet conduit 32 and discharges it back tothe hurling water chamber through the discharge conduit 3l and dischargepipe Il.

The vacuum pump exhaust air and other non- Vcondensible gases from`thereceiving chamber,

thereby creating a partial vacuum therein and discharges these gasesthrough the discharge.

pipe Il into-the hurling water chamber, from which they escape Vthroughan air vent pipe I1,

:which has an outwardly opening check valve 4I therein and leads fromthe top wall of the hurling water chamber. lIt will be understood thatthe hurling water chamber remains at or above atmospheric pressure,whereas a partial vacuum is maintained in the receiving chamber tofacilitate the return-of water and non-condensible gases from the steamheating system with which the pump is used.

An upright air conduit 50 extends from the top to the bottom wall ofthe'receiving chamber andY is heldin hubs 60, S* formed on said wallsand sealed therein. Cast integrally with the bottom wall of thereceiving chamber is an air conduit 5|, which opens Vat one end to theVbottom of the air conduit 50 and communicates with the air inlet of thevacuum pump. As shown. Vthe vair conduit 5I opens at its other end inthe same vertical plane as the other hereinbefore mentioned conduits,where it joinswith opens to the hurling water"` chamberl through anopening 39 in the wall 2|` thereof.

.of the receiving chamber.

l 2,815,946- the au inlet to the vacuumpumpas will be nrsupright mmm 1s.which :om 'with s rang' 11 sa ently described. l their upper endsthatforms the support for an Bolted or otherwise rigidly seemed te the topwall voi the receiving chamber over the open -v `upper end of the airconduit Il, is a hollow cap Il, which provides la passageway leadingfrom the upper end of the air'conduit to a port B3 in said top wall,which port opens to the receivl ing chamber, whereby air, vapors, andnon-condensible gases may be eihausted from the receivingchamber by thevacuum pump. The cap provides a casing for a check valve I4, desirablyofthe disc type. which is contained in a cage v"..seated in theport i8,andhavinga valve seat for the valve disc which closes an opening 'u lnthe cage. other openings s1 in tue wall vof the cageabove the valvedisc. together with the opening 5I provide communication between thereceiving chamber and air conduit 'when `the valve ls unseated. The capis formed with a semi-circular bridge 5l, which, together with thebottom face of the cap, bears upon a sealing ring 59 which is seated inan annular groove in the hub 68, and maires a, tight joint between theair conduit,` top wall, and cap. A sealing ring I9' is seated in anannular groove in the hub 9|* and makes a tight Joint between the lowerend ofthe air conduit and bottom In the end wall of the receivingchamber and vlocated above vthe bottom wall thereof, is a water wall ;electric pump motor 18. "The pump motor is of the vertical type and itsshaft 1l* is coupled to the verticalshaft 84, for the 'impellers of thetwo pumps, by a novel shaft coupling as will be pres.- ently described.

The vacuum fpump casing is formed with the v usual volute chamber 19, inwhich is contained the impeller Ill ofthe vacuum pump, andin the pump`casing Vmember 12 is formed the' usual volute chamber 8l yfor theimpeller I2 of the water pump. Betweenthe two volute. chambers isacireular.plate .88. which. forms a common wall for'y volute chambers:theedge portion of the plate 1 l seats in' 'grooves formed inthe meetingfaces of the pump base and water pump casing member.

shaft 84.

Any suitable vacuum pump, employing water Bothdmpellers are rigidly tothe impeller for its operation, may be employed and the one shown anddescribed in .my prior Letters Patent, No. 1,664,249, dated March27,1928, is 4an example y of such a pump, and reference vmaybe had tosaid Letters Patent for a full description thereof. Briefly, the vacuumpump casing below theim-l peller is bored asat 98, to receive the lowerend make-up water inlet 84 inthev air conduit, through which make-upwater for the vacuum pump is drawn into the air conduit and conducted tothe vacuum pump. A check ,valve `95, openingv in a direction from thereceiving chamber to the air conduit, is connected to' the latter by ashort nipple and an orifice nipple 96 is secured in the other open endof the check valve. Suction, created by the vacuum pump, draws waterfrom the receiving chamber at a point below the outlet opening 9|,through the air conduit to the vacuum pump and supplies the latter withmake-up water to compensate for any difference in loss.

, Bolted to or cast integrally with the end of the base containing theseveral conduits, hereinbeiore referred to, is a hollow pump base 61,which as a preference is cast with a pump casing 88 for the vacuum pumpIl and with a hurling water inlet 99, a'hurling water outlet 1l, and anair inlet conduit 1I, which are alignedgwith the conduits v82, Il and5l, and are held in intimate contact of an uprlghtcyllndrlcal wall 81,which separates a centrally located water intakepassage 98 from airintake passages 88. The water intake passage opens to the passageway inthe water inlet conduit 98, and an annular inletv passage 92 formedbetween the casing wall and cylindrical wall conv in the air inletconduit v'I withl nects the passage the air intake passages 89.

The cylindrical wall 81 extends axially into the interior of theimpellerto the top wall 99 thereof and 'is formed withwater outlet openings 9|,

' through whichhurling waterenters the passages The water suction inletconduit 62 isV formed with f a bolting ilange at its open end, bolted tothe wall I9 ofthe receiving chamber.

' The pump casing member 'l2 is also cast with a water discharge outlet14, which connects with the pipe connections to the boiler or otherplace Where the water is to be discharged. Usually, a check valve l5 iscontained in said pipe connections. l

Rising from the pump casing member 12, are

between the vanes of the impeller 80. The air intake passages conductthealr to the passages between the vanes. The openings 8l and air intakepassages 89 are vdisposed circumferentially around the cylindrical wallin alternate arrangement. Y 1 1 Y The cylindrical lllrall` 81 seatsuponv an annular seat 93, formed ln the bottom member of the vacuum pumpcasing wall and is held thereon by a bolt 84, which isthreadedly securedin .a boss formed on thebottom wall of the water inlet conduit 88. Thecylindrical wall is formed with a spider v95vfor receiving the upper endof the bolt.

The water pump impeller 92 is of conventional type employed incentrifugal 'water pumps, and is formed withfa central eye, which opensfrom thev water suction conduit 92. y

Both impellers are formed with hubs 80, l2* that surround the impellershaft. The hub of the water pump impeller bears against a bushing 96,which bears against a shouldered part 91 of the impeller shaft and the.end of Vthev hub of the vacuum pump impeller is beveled and bearsagainst a correspondingly beveled part of the bottom .shroud of thewater impeller, and nuts 98, threaded on the lower end oftheimpeller'shaft, serve to secure the impellers togethery and upon the Yimpeller shaft. A lsuitable Astuffing box 99 is formed on the pumpVcasing member t3V around the upper end of the impeller shaft.

The shaft coupling 8 5 is of novel construction.

The-motor shaft '18 and impeller shaft 84 are telescoped as shown inFig. 14, one of them being bored out to receive the end portion of theother shaft and the wall of the bored shaft is formed withseveral slitsthat extend lengthwise thereof `air vent pipe.

to a predetermined the other shaft. Two circumferential grooves lli areformed in the external faces of the shaft gripping outer faces of whichare oppositely tapered. Bearing against the tapered faces of the ringsare collars |03, which are formed with tapered inner faces thatcorrespond with the tapers of the tapered faces of the rings. Thecollars are provided with threaded connection for adjusting them towardand away from each other and as shown, they are formed withinterengaging threaded sleeves |04; desirably, the collars1 are formedwith hexagonal heads by means of which a wrench may be applied to themfor tightening them upon the rings. When tightened up. the beveled facesof the collars crowd the rings againstthe shaft gripping jaws andtherewith clamp the same uponthe shaft.

As is well'understood, the usual float and presim sure switches (notshown) are provided for start; ing and stopping the pump motor, but asthe construction and operation *of these switchesis well known, nodetailed description of them is thought necessary to the understandingof the present invention. Sometimes the water accumulates -to such-anextent that the pumps are required to operate for a longer time 'than isnecessary to bring the vacuum down to a normal low pressure. To preventan excessive low pressure from being created in the system, a .reliefvalve yor vacuum breaker i" is provided as is customary. In operationunder normal conditions vwith the motor running` and the water, air, andnonf condensible gases emptying `inw receiving chamber, the water pumpwithdraws water from the receiving chamber and pumps -it back to theboiler or other desired place and the vacuum pump builds up a partialvacuum in the receiving chamber and return mains. As has been explained,the vacuum pump receives its hurl. ing water from the hurling water.chamber and discharges it (together with air 'and other non condensiblegases which it exhausts from the receiving chamber through the airconduit) into the hurling water chamber, from which the air andnon-condensible gases escape through the Some make-up water `for thevacuum pump is withdrawn from the receiving chamber through the waterinlet port 04 and passes, along with the air flowing' in the airconduir., to the vacuum pump and is discharged into the hurling waterchamber, where it accumulates.

I the water in the hurling water chamber rises above the predeterminedlevel therein, it lifts the float of the float valve, thereby swingingup permitting the excess A ceiving chamber until the level of 'the waterin the hurling water chamber falls tothe predetemiined level.

The pumps Vcontinue to Avoperate until the required low pressure isobtained vin the receiving tank, yand the water therein has 4been pumpedout float and pressure switches.

When the motor stops and the pumps are at rest, thenwith a partialvacuum in the receiving chamber and atmospheric pressure in the hurlingwater chamber, water may slowly leak from the hurling water chamberthrough the vacuum pump past the hub of the vacuum pump impeller intothe volute chamber of the water pump'and through the water pump impellerto the suction low level 'as limited by the Jaws, in which are heldsplit rings in, the

Y 2,315,946 to provide shaft gripping Jawa III, that surround.

inlet of the water pump and into the receiving chamber. However, whenthe level of the water in the hurling water chamber falls below itspredetermined level, the float lowers, swings the i'ioat lever down andunseats the valve, per

mittingair from the hurling 4waterlchamber to flow into the receivingchamber until the pressure in both chambers is 'equalized, whereby theleaxage of the water from the hurling water chamber through the pumps tothe receiving chamber ceases when the water in both chambers reaches acommon level. As a result, a sufficienthead of water is preserved in thehurling water chamber to supply the vacuum pump with water for itsoperation.

At night, when the boiler is shut down, then in case the pressuretherein falls below the low pressure in the receiving chamber, and maytend to syphon water out of the receiving chamber and hurling waterchamber, then when the level ofthe water in the hurling water chamberlowers and unseats the float valve, air is admitted from the hurlingwater chamber to the receiving chamber, thereby equalizing the pressurein both chambers, and if the level of the water lowers to the suctionoutlet of the water pump, the vacuum will extend to the receivingchamber and hurling water chamber, thereby preventing more water frombeing syphoned out. As la result, there is always sufficient hurlingwater left to supply the vacuum pump for its operation when theapparatusv is again started.

More or less variation of the exact 'details of construction is possiblewithout departing from the spiritof this invention; I desire, therefore.

"not to limit myself to the exact form of the construction shown anddescribed, but intend. in

the following claims to point out all of the in- I vention disclosedherein.

I claim as new, and desire to secure by Letters Patent:

the noat lever and unseating the valve,

water to drain into the re the hurling'water chamber and receivingcharnber, the iloat of which is contained in the .hur1- ing waterchamber and acts to open the valve when moved upwards or downwards fromits normal position as governed by a predetermined water level in thehurling water chamber.

2. In a vacuum condensation pump, the combination with a receivingchamber anda hurling water chamber, having a port therebetween, saidhurling water chamber opening out to the atmosphere, a water pump and avacuum pump connected to the receiving chamber, said vacuum pump alsohaving hurling water connections with the hurling water chamber, of a`valve device controlling said port and comprising a valve seat and afloat operated valve, the float of said valve being located in thehurling water chamber Aand being adapted to unseat the valve when movedupwards or downwards from a normal position as governed by apredetermined normal levelof the water in the hurling water chamber.

3 In a vacuum condensation pump, the combination with a receivingchamber and alhurling water chamber, having a port therebetween, saidasians ing to the base, an aircondult leading from the upper end of thereceiving chamber to the air hurling water chamber opening outto theatfmcsphere, a waterpump and a vacuum vpump connected tothe receivingchamber, said vacuum pumpalso having hurling water connections with thehurling water chamber, of a valve device controlling saidcport andcomprising a valve seat, a

valve adapted to seat on said valve seat, anda float lever and fioatforpperating the valve, the

iloat being locatedin the hurling water chamber and said oat lever beingconstructed. and arranged to unseat the valve when moved upwards ordownwards from a normal position as governed by a 'predetermined normallevel of .the water in the hurling water chamber,

4. In a vacuum condensationpump,thefcombination with a receiving chamberand ahurling water chamber having a port therebetween, said inlet of thevacuum pump, and inlet and discharge conduitsleading from thehurling'water chamber through the hollow of the base to-the v endthereof which supports the pump base, said last mentionedfconduitsopening to the water inletvan'd discharge outlet' respectively to thek8*.,Ina. vacuum condensation'v pump, the combination of `a tank havinga receiving chamber and al hurling wate'nchamber, a hollow basesupporting said tank, said receiving chamber Vhaving a Water dischargeopening in one end wall disposed above its bottom, an, air conduit'leading lfrom the upper end oLthe receiving" chamber, through thehollow of the base. 't0 one hurling vwater chamber opening out tothevatv.

mosphere, a water pump and a vacuum-pump j connected to the receivingchamber, saidvacuum pump also having hurling water connections with thehurling water chamber, of a valve device coni f trolling said port andlcomprising a valve seat, a

ball valveadapted to seat on said valve seat,and anoat lever having aiioat on one arm and a pair of ilngersvon the other arm straddling said'ball ing water chamber and arranged to vunseat the y base bolted to`the, end of `the tank base containing th ends' or said conduits, saidpump y base having a water pump, and a vacuum pump valve, said iloatlever being locatedin the" hurl- ,I

ball valve when moved upwards or downwards v from anormal position asgoverned by apredetermined normal level oi' the water .in lthe l,

hurling water chamber. v

5. A vacuum condensation pump comprising in combination a receivingchamber Aand a hurling .water chamber having a float valve controlledport therebetween, a water pump connected with said receiving chamber, avacuum pump i emend thereof and said hurling water. chamberhavingwater'inlet and discharge conduits leading. therefromthrough thehouow of the base to the same end as the air conduit leads, a pumpcarried thereby,the suction inlet of the water pump opening to thelwater discharge opening of .the receiving chamberandthe vacuum pumphaving an airinle't, opening to the air conduit and water inlet anddischarge openings, opening respectively to the said charge conduits. Yn

9. Ina'vacuum condensation pump, the combination of a receivingchamberand a hurling water chamber having a port therebetween, a waterpumpfor discharging'v water from thev rewater inlet and disv ceivingchamber, an' air pump ofthe type employing water for its operation, anair conduit leading from the 'upper end of `the receiving chamber to thesuction inlet of the vacumn pump, a make-up water inlet, opening to theair conduit at a place below the suction inlet to the water pump, awater inlet conduit leading from the hurling water chamber to thesuction inlet of the vacuum pump and a discharge conduit leading fromthe discharge end oi.' the vacuum pump to the hurling water chamber.

6. In a vacuum condensation pump, the combination of a receiving chamberand a hurling water chamber having a float valve controlled porttherebetween of which the oat is contained in the hurlingL water chamberand arranged to open the valve when moved upwards or downwards from anormal position as controlled by a predetermined water level in thehurling 'water` chamber, Water and air pumping means comprising a pumpcasing, a water pump impeller and a vacuum pump impeller in said casingand both mounted on a vertical motor driven impeller shaft, said casinghaving a water inlet for the Water impeller connected With saidreceiving chamber, an air inlet in communica- .tion with the upper endof the receiving chamber and water inlet and discharge openings,respectively in communication with the hurling water chamber.

7. A vacuum pump comprising in combination a tank having areceivingchamber and a hurling tank, a pump base at one end of the tankbase. a water pump and' a vacuuml pump associated with said pump base,the water pump having a suction inlet, opening to said receiving chamberand the vacuum pump having an air inlet,

a water inlet, and a discharge outlet, all leadployingwaterior itsoperation, having an air v inlet, a water inlet, and a discharge outlet,said hurling; water chamberhaving an air 'vent and water chamber, ahollow base supporting said having connections with the water inlet andthe discharge outlet of the vacuum pump, an air conduit leading from theupper end of thereceiving chamber to the air inlet of the vacuum pump, afloat operated valve for controlling the port between the receivingchamber and hurling water chamber operating toclose said port at apredetermined normal water level in the hurling water chamber and toopen said port when the water level rises or falls below said prede-Vtermined level, whereby water drains from the hurling water chamber tothe receiving chamber in a high position of the iloat and the pressurein the hurling water chamber and receiving chamber equalizes in a lowposition of the float.

10. The combination of a base portion formed with a hurling waterdischargeconduit, a receiving chamber and a hurling water chamberarranged side by side carried by said base portion with said inlet anddischarge conduits leading :from said hurling water chamber, a -prumpbase mountedy on said base portion and having a pump casing containingtwo volute chambers, a Water impeller inone volute chamber and an airimpeller in the other volute chamber, a mo-l tor driven shaft on whichsaid impellers arethe vacuumpump is admitted to said vacuum;

pump from the receiving chamber.

l2. A vacuum condensation pump comprising in combination a receivingchamber, a hurling water chamber, which opens out to the atmosphere. awater pump connected to the'receiving chamber for withdrawing watertherefrom, a. vacuum pump which employswater for its operation, therebeing two air ports in the top wall of the receiving chamber, achambered cap bolted to said top wall over said air ports with said airports in communication with said chamber. a check valve -in saidchamber, opening away from the receiver, an air conduit. leading fromthe other air port to the air intake of the vacuum pump, and water inletand discharge conduitsl leading from the hurling water chamber to thewater inlet and discharge outlets respectively. of the vacuum pump.` y

13.V A vacuum condensation pump comprising in combination a. base, atank formed integrally therewith and having a receiving chamber and ahurling water chamber disposed side by side, the latter of which opensout to the atmosphere, water and air pumping means carried by said baseand comprising a pump casing disposed at one side o! and bolted to saidbase. a water pump impeller and a Vvacuum pump impeller therein, avertical motor driven impeller shaft upon which both of said impellersare mounted,

the upper end of the receiving chamber to said air inlet of the vacuumpump casing, and water inlet land dischargev conduitsl connecting thehurling water chamber with the water inlet and discharge outletsrespectively of the vacuum pump.

14. In a'vacuum condensation pumlmthe combination of a base, a tankthereon having a partition dividing' the same into a receiving chamberand a hurling water chamber, cross walls in the hurling water chamberproviding a water and air inlet passage from a wall ofthe tank to thereceiving chamber, there being a float valvek controlled port in a wallc! said inlet passage of which the float is contained in the hurlingwater chamber, saidiiloataoting to open the valve when moved upwards orvdownwards romy a normal position as governed by a predetermined waterlevel in the hurling water chamber, a water pump and a vacuum pumpmounted on said base, the water pump having a suction inlet opening tothe receiving chamber through an opening in a wall thereof, and saidvacuum pump having an air inlet in communication with the upper end ofthe receiving chamber, sarid vacuumpump having also a water inlet and adischarge outlet, a water inletrconduit leading from the hurling waterchamber to the water inlet of the vacuum pump, a discharge conduitleading from the dischargeoutlet of the vacuum pump and terminating inan upright discharge pipe' in the hurling 'water j chamber.

